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Publikováno v:
Faraday Discussions v153 p343-360 (2011)
The use of strong-field (i.e. intensities in excess of 10^13 Wcm-2) few-cycle ultrafast (durations of 10 femtoseconds or less) laser pulses to create, manipulate and image vibrational wavepackets is investigated. Quasi-classical modelling of the init
Externí odkaz:
http://arxiv.org/abs/1208.1882
Autor:
Bryan, W. A., Stebbings, S. L., McKenna, J., English, E. M. L., Suresh, M., Wood, J., Srigengan, B, Turcu, I. C. E., Smith, J. M., Divall, E. J., Hooker, C. J., Langley, A. J., Collier, J. L., Williams, I. D., Newell, W. R.
Publikováno v:
W A Bryan et al, Nature Physics 2 p379-383 (2006)
Modern intense ultrafast pulsed lasers generate an electric field of sufficient strength to permit tunnel ionization of the valence electrons in atoms. This process is usually treated as a rapid succession of isolated events, in which the states of t
Externí odkaz:
http://arxiv.org/abs/1003.0821
Autor:
Bryan, W A, Calvert, C R, King, R B, Nemeth, G R A J, Greenwood, J B, Williams, I D, Newell, W R
Publikováno v:
W A Bryan et al 2010 New J. Phys. 12 073019
A quasi-classical model (QCM) of molecular dynamics in intense femtosecond laser fields has been developed, and applied to a study of the effect of an ultrashort `control' pulse on the vibrational motion of a deuterium molecular ion in its ground ele
Externí odkaz:
http://arxiv.org/abs/1001.1138
We present a new algorithm for vibrational control in deuterium molecules that is feasible with current experimental technology. A pump mechanism is used to create a coherent superposition of the D2+ vibrations. A short, intense infrared control puls
Externí odkaz:
http://arxiv.org/abs/0806.2253
Autor:
Bryan, W. A., McKenna, J., English, E. M. L., Wood, J., Calvert, C. R., Torres, R., Murphy, D. S., Turcu, I. C. E., Collier, J. L., McCann, J. F., Williams, I. D., Newell, W. R.
Publikováno v:
Phys. Rev. A 76, 053402 (2007)
Tunnel ionization of room-temperature D$_2$ in an ultrashort (12 femtosecond) near infra-red (800 nm) pump laser pulse excites a vibrational wavepacket in the D2+ ions; a rotational wavepacket is also excited in residual D2 molecules. Both wavepacket
Externí odkaz:
http://arxiv.org/abs/0711.0953
Autor:
Bryan, W. A., English, E. M. L., McKenna, J., Wood, J., Calvert, C. R., Torres, R., Turcu, I. C. E., Collier, J. L., Williams, I. D., Newell, W. R.
Publikováno v:
Phys. Rev. A 76, 023414 (2007)
A coherent superposition of rotational states in D$_2$ has been excited by nonresonant ultrafast (12 femtosecond) intense (2 $\times$ 10$^{14}$ Wcm$^{-2}$) 800 nm laser pulses leading to impulsive dynamic alignment. Field-free evolution of this rotat
Externí odkaz:
http://arxiv.org/abs/0706.4077
Publikováno v:
Annual Report 2004/2005, Central Laser Facility, RAL (2005) 90
In our model the electron dynamics are described by a two-state approximation. This might appear a rough approximation since it neglects coupling through excited electronic states and ionization channels. However at high intensity (laser fields equiv
Externí odkaz:
http://arxiv.org/abs/physics/0604118
Publikováno v:
Annual Report 2003/2004, Central Laser Facility, RAL (2004) 81
We simulate the dynamics of H2+ and HD+ by direct solution of the time-dependent Schroedinger equation for the electronic and nuclear motion for the interaction of intense femtosecond pulses. On these timescales the rotational motion, even for such l
Externí odkaz:
http://arxiv.org/abs/physics/0604117
Autor:
Bryan, W A, Stebbings, S L, McKenna, J, English, E M L, Suresh, M, Wood, J, Srigengan, B, Turcu, I C E, Williams, I D, Newell, W R
Publikováno v:
J. Phys. B/ vol 39 pS349 (2006)
The probability of multiple ionization of krypton by 50 femtosecond circularly polarized laser pulses, independent of the optical focal geometry, has been obtained for the first time. The excellent agreement over the intensity range 10 TWcm-2 to 10 P
Externí odkaz:
http://arxiv.org/abs/physics/0512152